Ideas for separating single-metered duplexes?

[Alissa Engel]

Hi! We own several duplexes where the water isn’t separately metered. I recently listened to a Podcast discussing this issue, but I was driving, didn’t write the info down, and now I can’t find the episode! The gist of the episode was that paying utilities can kill your bottom line. So, we are looking for ways to separate the water bill (one duplex is over $300 a month) and pass it to the tenants. This episode mentioned a device that attaches to the meter and separates the usage. Another complicating factor is that several have sprinkler systems, which makes the “separating” more difficult. Does anyone know what this device is called? Does anyone have experience using it? And does anyone have ideas for other ways of separating and passing these bills to the tenants? Thank you!